Offshore continuation of volcanic rift zones, El Hierro, Canary IslandsM.J.R.GeeauthorD.G.MassonauthorA.B.WattsauthorN.C.MitchellauthorEl Hierro is the youngest and most southwesterly of the seven Canary islands. The established view, based on subaerial geology, is that El Hierro is a classic example of an oceanic island with 120° –– spaced volcanic rift arms (VRZs) forming a "merce2001Article